Electrode holder



Jan. 26, 1932. l I 5, oss 1,842,627

\ ELECTRODE HOLDER FileQ Jan. 28, 1929 Patented Jan. 26

PAUL S. ROSS OF DENVER, COLORADO nnncrnonn HOLDER Application filed January 28, 1929. Serial No. 335,486.

This invention relates to electrode holders for use in electric welding and its principal object is to provide a tool of simple construction adapted to grasp electrodes of ditlerent sizes with variable pressure and without the use. o't springs. r

Another object of the invention resides in providing means for the operation of a movablejaw of the tool. in conjunction with a shield that protects the hand of the operator.

Further objects reside in an improved method oi insulating the handle of the tool and in details ot' construction and a. novel arrangement of parts. all of which have been shown in the preferred embodiment ot the invention illustrated in the accompanying drawings.

In the drawings. in the several views of which like parts have been similarly desig nated,

Figure 1 represents an elevation of the improved'electrmlc holder.

Figure 2, an enlarged longitudinal section of the same,

Figure 8, an enlarged section along the line 33. Figure 1,

Figure 4: an enlarged section taken on the line l4., Figure '1, a

Figure 5, a section along the line 55, Figure 2,

Figure 6, a. section on the line (S al, Figure 2, and

Figure 7, a section along the line 77, Figure 2.

The, tool, as shown, Comprises a hollow handle 5 of fiber or other insulating material, a protective shield 6 of similar material, a stationary gripping member 7, a movable gripping member 8 fulcrumed for movement with relation to the relatively stationary member by a bolt 9. a rotary cam element 10 for the operation of the movable jaw-member, and a housing12 for the rotary cam. J The stationary gripping member, preferably made of copper, has a jaw 13 transversely notched to engage electrodes of different diameters either in the notches or between the same, cars 14 for the pivotal connection of the movable member, and a shank 15 upon the shank 15.

which the operating parts of the tool are assembled.

- The movable grippinginembcr may he made of channeled steelor other strong met-- al. lts jaw 16 has a copper inlay 1?. to coopcrate. with the jaw or the stationary inemher, it has cars 18 that lap the earsot the stationary member for their pivotal con -ection by means of the he tore mentioned inlcrnm-hol 9. and it has an arm 19 projecting rcarwardly from the fulcrum to'engag c with the rotary cam which tnnctions to press the jaws of the members together so as to firmly grip an electrode between them.

The cam consists of a circular disk having a central collar 20 tor its firm support upon 1 The disk has in its torward lace. an eccentric groove 21 into which "the end of the arm 19 or" the movable jaw loosely extends and it is connected with the circular shield ot' the tool by a dowel pin'22.

The shield titted upon the collar ot the cam lies fiat against the rearward side oi the same,

and it has a notch 98 to facilitate its rotation by the insertion ot' the thumb on the hand of the operator that holds the tool in the welding operation.

The hollow cylindrical handle 5 is concentric with the shank of the stationary gripping member and extends beyond the end thereof. It abuts against the shield and it istastened to the shank by means of screws 2% and and an annular filler 26 in the space between the handle and the shank. The shank is screw-threaded at its end within the handle for the attachment of a chuck 27 to which. in practice, theelectric cable is attached by means of solder. t

The chuck has opposite flat faces for the application of a Wrench it being essential that the joint between the shank and the chuck he kept tight toprevcnt leakage of electricity.

It is to be noted that the air-space between the shank and the handle aids in insulating the conductive parts from the hand in which the tool is held.

The cam is enclosed in the housing 12 consisting of a flanged metal cover having a collar 28 for its attachment to the shank by.

I means of a pin 29. The housiiig protects the cam ,wheel from sparks produced in the welding operation and it has an opening 30.

' through which the end of the arm of themovable aw'passes,to' enter the groove of the cam.

. ing, in the housing is occupied-by the arm'- groove through-the opening.

It will be seen that inasmuch as -the open ing a shank beyond the fulcrum,- and a rotary cam mounted to move aboutthe shank of the one member, and having in its face, an cecentric slot engaging with the arm of the other member: l0

4.' An electrode holder comprising a pair of gripping members, one of which is fulof the movable jaw at its portion opposite the cam-groove, no sparks can enter the In the use of the tool, he electrode is placed between the jaws ofthe'gripping.

- member and the cam is rotated by means of.

( increased to any desired-extentand tl1e-inclamped in place.

the. shield until the electrodeis rigidly The pressure upon the electrode may be herent resiliency of thechanneled movable I gripping memberincreases the. pressure of its aw upon the electrode. The copper inla yis highly conductive and 'of gripping members one of which is fulcrumed to move toward the'other member,

ingashank said ther member hav' ahandle, arotary "ca m mounted on the handle and operatively cooperates with the copper stationaryjaw to dissipate a large amount of the heat gen erated at the electrode, before it can reach the handle of the tool.

-The absence of springs greatly increases the life of the tool since it iswell known that in similar -t s employing sprin tension and otherwise deteriorate in a short time. Moreover, the pressure exerted by the spring is constant whereas in the present tool the pressure produced by the action of the cam in the movable jaw is variable'to' an required degree. a

at I claim and desire to secure by Let-.

' ters Patent is 1'. An electrode holder comprising a pair of gripping members, oneof which is fulthe arm of the other member, and a handle ar und the shank rearward'ot-the cam. I

- 2. An electrode holder comprising a pair of gripping members,'one of which is fulcrumed to move toward the other, the ful crumed member havingan arm extending from its fulcrum and-the'other member having a shank beyond the fulcrum, a rotary cam mounted to rotate about the shank of the I one member, in operativeen agementwith the arm of the other mem r, a handle 7 around the shank rearward of the'.cam, and

connection with the eam. 7

3. An electrode holdercomprisi'ng a. pair of gripping members, one of which is ful- ,to press. the jaws together, the springs oose their 'by the other member.

a shield forward of'the handle in operative engaging the fulcrumed member to move .it to and from the handled member, and a prd a tective shield mounted on-the 1 and surrounding the handle in transverse relation thereto.

6. An electrode holdercomprising' a pair of gri ping members one of which is ful.-' crume tomove toward the other member, said other member having a handle, a rotary cam mounted on the handle and operatively engagin the fulcru'med member to moveit to and i rom the handled member, a protective' shieldmounted onv the cam and sur- 1.. rounding the handle in transverse relation thereto, and' a housing mounted on the handle and cooperating with the shield to enclose the cam;

7 An electrode holderoomprising a pair of gri ping members, one of which'is fulcrumed to movetoward the other, and a cam rotatably mounted on one of the members, the cam having an eccentric groove engaged 8; An electrode holder comprising a grip: ping element composedfof .a pair of aw members, one of which is' fulbrumed to'move toward-thebther, one of said members having'a handle, a shield mounted on the handle, and a rotary cam mounted on the shield in engagement with the ful'crumed member to move'the same aboutyits fulcrum.

In testimony whereof I have afiixed my signature. S. ROSS. 

